While FPS-games certainly are more common now than years ago, the old, fast paced, unrealistic style of FPS-games such as Quake, DOOM or Unreal are almost a dying breed.
However, for those looking for a hardcore single player or co-op FPS experience, the remake,
Serious Sam HD - The First Encounter was released today for the PC (via Steam) and Xbox360 with a fairly light price tag of 20.
Serious Engine 3 High-resolution visuals and lushly redesigned environments to create the most astonishing Serious Sam game ever
Frantic Non-Stop Action From the charging Sirian Werebull to the screaming Headless Kamikaze and the multi-story Ugh-Zan, all of the infamous minions of Mental have been spectacularly redesigned for Serious Sam HD
Great Arsenal Wield demon-stopping revolvers, lead-spewing miniguns, and monstrous cannons for when you absolutely, positively, have to kill every enemy in sight
Over 14 Levels of Bedlam Set against the expansive backdrop of ancient Egypt with every square inch upgraded and reworked to create one of the most visually stunning game experiences
Co-Op Mode Embrace the mayhem with up to 16 players
Steam Cloud Support With Steam Cloud your profile is stored on the Cloud servers. Data about your bindings, last played level, progress so far, and other data are stored online. When you log in from another machine, your settings and stats are always up to date. The per-machine settings, like resolution, performance settings, etc, and save games are stored locally. The profile is compressed to only a few kB, so the transfer is very fast.
Minimum Requirements
OS: Windows XP w/SP1 or newer
Processor: Intel Pentium 4 3+ Ghz or AMD Athlon64 3500+
Memory: 1 GB
Graphics: nVidia GeForce 7600, ATI Radeon X1600 (Shader Model 3.0 Highly Recommended)
DirectX: DirectX 9.0c August 2009 Edition or newer
Source: Steampowered.com (purchase link)